Storing numbers larger than Big integer C#

See also questions close to this topic

• C# - Adding condition to func results in stack overflow exception

  I have a func as part of specification class which sorts the given iqueryable

  Func<IQueryable<T>, IOrderedQueryable<T>>? Sort { get; set; }
  

  When i add more than one condition to the func like below , it results in stack overflow exception.

  spec.OrderBy(sc => sc.Case.EndTime).OrderBy(sc => sc.Case.StartTime);
  

  The OrderBy method is implemented like this

  public ISpecification<T> OrderBy<TProperty>(Expression<Func<T, TProperty>> property)
      {
          _ = Sort == null ? Sort = items => items.OrderBy(property) : Sort = items => Sort(items).ThenBy(property);
          return this;
      }
  

  Chaining or using separate lines doesn't make a difference.

  This problem gets resolved if I assign a new instance of the specification and set it's func, but i don't want to be assigning to a new instance everytime. Please suggest what am i missing here and how to reuse the same instance (if possible).
• How to projection fields for a dictionary (C#, MongdoDB)

  I am trying my luck here, I have a model which is like the following

  public class RowData : BaseBsonDefinition
  {
  .
    [BsonExtraElements]
    [BsonDictionaryOptions(DictionaryRepresentation.ArrayOfDocuments)]
    public Dictionary<string, object> Rows { get; set; } = new(StringComparer.OrdinalIgnoreCase);
  .
  }
  
  

  In result, the schema in the MongoDB looks like

  {
  "_id": {
      "$binary": {
        "base64": "HiuI1sgyT0OZmcgGUit2dw==",
        "subType": "03"
      }
    },
    "c1": "AAA",
    "c8": "Fully Vac",
    "c10": "",
  }
  

  Those c1, c8 and c10 fields are keys from the dictionary, my question is how to dynamic project those fields?

  I tried

  Builders<RowData>.Projection.Exclude(p => "c1")
  

  It seems the MongoDB driver can not handle a value directly.

  Anyone could point me in the correct direction?

  Thanks,
• How do I add new DataSource to an already Databinded CheckBoxList

  i'm building a web form that show Database's item(Tables, Rows, FK,...)

  I have a CheckBoxList of Tables (chkListTable) which will show a new CheckBoxList of Rows (chkListRow) everytime I SelectedIndexChanged from chkListTable. The problem is i can show the items from chkListTable with 1 selected item. But i don't know how to show chkListRow if multiple item from chkListTable are selected.

  Here are my codes:

  aspx:

  <div>
               <asp:Label ID="Label2" runat="server" Text="Table: "></asp:Label>
               <asp:CheckBoxList ID="chkListTable" runat="server"
                   DataTextField="name"
                   DataValueFeild="name"
                   AutoPostBack="true"
                   OnSelectedIndexChanged="chkListTable_SelectedIndexChanged">
               </asp:CheckBoxList>
          </div>
          <div>
               <asp:CheckBoxList ID="chkListRow" runat="server"
               DataTextField="COLUMN_NAME"
               DataValueField="COLUMN_NAME"
               RepeatDirection="Horizontal">
               </asp:CheckBoxList>
          </div>
  

  aspx.cs:

  protected void chkListTable_SelectedIndexChanged(object sender, EventArgs e)
      {
          tableName.Clear();
          
          foreach (ListItem item in chkListTable.Items)
          {
              if(item.Selected)
              {
                  tableName.Add(item.Text.Trim());
              }    
          }
  
          for(int i = 0; i < tableName.Count; i++)
          {
              String query = "USE " + dbname +
                  " SELECT * FROM information_schema.columns" +
                  " WHERE table_name = '" + tableName[i] + "'" +
                  " AND COLUMN_NAME != 'rowguid'";
              chkListRow.DataSource = Program.ExecSqlDataReader(query);
              chkListRow.DataBind(); 
              Program.conn.Close();
          }
      }
  

  Program.cs:

  public static bool Connect()
      {
          if (Program.conn != null && Program.conn.State == ConnectionState.Open)
              Program.conn.Close();
          try
          {
              Program.conn.ConnectionString = Program.constr;
  
              Program.conn.Open();
  
              return true;
          }
  
          catch (Exception e)
          {
              return false;
          }
      }
  
      public static SqlDataReader ExecSqlDataReader(String query)
      {
          SqlDataReader myreader;
          SqlCommand sqlcmd = new SqlCommand(query, Program.conn);
          sqlcmd.CommandType = CommandType.Text;
          if (Program.conn.State == ConnectionState.Closed) Program.conn.Open();
          try
          {
              myreader = sqlcmd.ExecuteReader();
              return myreader;
              myreader.Close();
          }
          catch (SqlException ex)
          {
              Program.conn.Close();
              return null;
          }
      }
  

  I want my display to be like this:

  [x]Table1 [x]Table2 [ ]Table3
  [ ]Row1(Table1) [ ]Row2(Table1) [ ]Row3(Table1)
  [ ]Row1(Table2) [ ]Row2(Table2)
  
• how could i access the memory of a process on the system using go?

  I'm studying cheats and anti cheats. and I would like to know how I could access the memory of another process through its "Pid",

  For Example

  csgo is running and its pid is 123456 I would like with my program go to access the memory of this process and have access to the life pointers or ammunition.
• What is the right memory allocations that can be given to multiple spark streaming jobs if it is being processed in a single EMR cluster (m5.xlarge)?

  I have 12 spark streaming jobs and it receives a small size data at any time. These scripts has spark transformations and joins.

  What is the right memory allocations can be given to these spark streaming jobs if it is being processed in a single EMR cluster (m5.xlarge) (not using EMR steps) ? The memory allocations includes num-executors, executor-memory etc.

  Please explain the working of these spark jobs in the cluster. How will the cluster split resource to these jobs? Please help me with the basics.
• Checking whether space should be printed in the middle or at the end in for loop?

  I am trying to give info to my program whether it should print space or not. I am dealing with prime factorization.

  0
  1
  2               2 
  3               3 
  4               2 2// I dont wanna print space at the end
  5               5 
  6               2 3 //but between two nums or more I want space to be added
  7               7 
  8               2 2 2 
  9               3 3 
  10              2 5 
  11              11 
  12              2 2 3 
  13              13 
  

  My code looks something like this, and its printing spaces at the end (which is not what I want)

  void function(int given_limit)
  {
      int current_num = 2;
      while (given_limit > 1)
      {
          if (given_limit % current_num == 0)
          {
              if (current_num == 2)
              {
                  printf("%d ", current_num);
              }
              else if (current_num == 3)
              {
                  printf("%d ", current_num);
              }
              else if (current_num == 5)
              {
                  printf("%d ", current_num);
              }
              else if (current_num == 7)
              {
                  printf("%d ", current_num);
              }
              else
              {
                  printf("%d ", current_num);
              }
  
              given_limit /= current_num;
          }
          else
              current_num++;
      }
      printf("\n");
  }
  

  In main() I am calling it something like this:

  int main()
  {
      int given_limit = 13;
      for (int i = 0; i <= given_limit; i++)
      {
          printf("%d\t\t", i);
          function(i);
      }
  }
  

  I would appreciate any tips and help. One of the ideas is maybe to store it in an array.
• Why function is executed prior to printing of string in Python?

  I'm executing this code:

  #Printing a list of prime numbers till an input number:
  def is_prime(input):
      for counter1 in range(1,input):
          if(counter1==2):
              print("Prime number: 2")
          counter2=2
          while (counter1%counter2!=0 and counter2<counter1):
              if(counter2==(counter1-1)):
                  print("Prime number:",counter1)
              counter2+=1
  
  print("Let us print prime numbers upto 10:",is_prime(10))
  

  OUTPUT:

  Prime number: 2
  Prime number: 3
  Prime number: 5
  Prime number: 7
  Let us print prime numbers upto 10: None
  

  Why "Prime numbers:" are printed first then the string "Let us..." ??
• Want to convert big numbers into exact number string

  const num = 100000000000000000000001
  
  console.log(num.toString()) //1.0000000000000001e+23
  console.log(num.toLocaleString('fullwide', { useGrouping: false })) //100000000000000010000000
  

  I want to convert num in to exact string like 1000000000000000000001. I tried these two methods but non of them works. At last I want to split these individual digits into an array and array doesn't works on number that's why i want to convert it to exact string.
• BigInteger in Python?

  I currently need to write a receiver program in python and i wonder what i am doing wrong. In java i have (code snippets obviously):

      byte[] fileSize = new byte[2];
      BigInteger bi = new BigInteger(fileSize);
      System.out.println("FileSize in Bytes: " + bi);
  

  which gives back the value of: FileSize in Bytes: 27762

  If i print out the array byte fileSize, i get the following values back:

  for(int u = 0; u < fileSize.length; u++){
  
      System.out.println(fileSize[u]);
              
  }
  

  this gives back: 108 and the value 114.

  I receive those two values on the python side (its sended trough a Datagram to the Python receiver). How do i combine them or transform them into the value 27762 like BigInteger returns in Java? Kinda lost on this.

  Any ideas would be great!

  Thanks in advance!
• Multiplication of 2 positive numbers in Julia gives a negative product

  In Julia 1.7.2 multiplication of 3037000691 and 3037000693 returns the negative product -9223370870501072753. The product I expected is 9223373203208478863.

  function m(a::BigInt, b::BigInt)::BigInt
      a * b
  end
  

  This function gives the same negative result.

  Any ideas on how to get the correct answer in Julia 1.7.2 to 3037000691 * 3037000693 ?

  P.S.
  I did run into this issue doing some math on (big) twin prime numbers.